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c in (-oo:+oo)
36 = (-4/9)*c // - (-4/9)*c
36-((-4/9)*c) = 0
(4/9)*c+36 = 0
4/9*c+36 = 0 // - 36
4/9*c = -36 // : 4/9
c = -36/4/9
c = -81
c = -81
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